Fourier Series Solutions to the Vibration of Rectangular Lightweight Floor/Ceiling Structures

Chung, Henry; Emms, Grant

doi:10.3813/aaa.918048

Cited by 18 publications

(13 citation statements)

References 12 publications

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“…2. The experimental designs were determined based on the numerical simulations (see (8)) and the building practicality. For example, the simulations prior to the experiments had shown that increasing the cavity depth would have had little effects on the vibration level of the ceiling.…”

Section: Examples Of Ltfssmentioning

confidence: 99%

Vibration Reduction in Lightweight Floor/Ceiling Systems with a Sand-Sawdust Damping Layer

Chung

Emms²

2014

Acta Acustica united with Acustica

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This paper shows how to use a mathematical model to predict the vibration of lightweight timber-framed floor/ceiling systems (LTFSs) caused by mechanical excitation. The LTFS considered here is made up of an upper floor layer, a cavity space with timber joists and a ceiling. These components are joined by timber battens, ceiling furring channels and ceiling clips. The vibration in the structure is caused by a localized excitation on the top surface and the resulting vibration level of the ceiling surface will be analysed. The cavity space is filled with fibre infill for damping the sound transmitting through the cavity. A unique feature of the design and the model is the sand-sawdust mixture in the upper layer. The theoretical model and the experimental measurements show that the sand-sawdust dampens the vibration in the frequency range between 10 and 200 Hz. The damping by the sand-sawdust and the fibre infill are found by comparing the numerical simulations against the experimental measurements. We show that the simple linear frequency dependent loss factors can be used to predict the low-frequency vibrations of LTFSs.

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Section: Examples Of Ltfssmentioning

confidence: 99%

Vibration Reduction in Lightweight Floor/Ceiling Systems with a Sand-Sawdust Damping Layer

Chung

Emms²

2014

Acta Acustica united with Acustica

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“…It should be noted that timber I-beams were used for joists in this system, however our numerical modelling showed that the same result would have been achieved with standard timber joists. Figure10 shows numerical simulations of the effect of using various values of stiffness and mass density in the upper layer [1]. The mass density and the stiffness were varied in order to confirm that the damping by the sand-sawdust could not be achieved by replacing it with layers that provide only mass and stiffness.…”

Section: Aerated Concrete Top Layermentioning

confidence: 99%

Lightweight Floor/Ceiling Systems with Improved Impact Sound Insulation

et al. 2010

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Contrary to common belief, a relatively simple and practical lightweight timber based floor/ceiling can have impact sound insulation superior to that of concrete slab based systems. This paper presents examples of such systems that include vibration isolation/damping features, such as rubber ceiling batten clips, glass fibre wool, and a sand-sawdust mixture layer. We give enough details to reproduce our experiments and build the proposed lightweight systems.

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“…One of them is the use of modal bases for solving the differential equations, as done by Sjökvist et al [36], Brunskog [11] and Chung and Emms [17]. It consists of expressing the vibration and acoustic fields in terms of the eigenfunctions of the problem.…”

Section: Introductionmentioning

confidence: 99%

The finite layer method for modelling the sound transmission through double walls

Díaz-Cereceda

Poblet-Puig

Ferran

2012

Journal of Sound and Vibration

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The finite layer method (FLM) is presented as a discretisation technique for the computation of noise transmission through double walls. It combines a finite element method (FEM) discretisation in the direction perpendicular to the wall with trigonometric functions in the two in-plane directions. It is used for solving the Helmholtz equation at the cavity inside the double wall, while the wall leaves are modelled with the thin plate equation and solved with modal analysis. Other approaches to this problem are described here (and adapted where needed) in order to compare them with the FLM. They range from impedance models of the double wall behaviour to different numerical methods for solving the Helmholtz equation in the cavity. For the examples simulated in this work (impact noise and airborne sound transmission), the former are less accurate than the latter at low frequencies. The main advantage of FLM over the other discretisation techniques is the possibility of extending it to multilayered structures without changing the interpolation functions and with an affordable computational cost. This potential is illustrated with a calculation of the noise transmission through a multilayered structure: a double wall partially filled with absorbing material.

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Fourier Series Solutions to the Vibration of Rectangular Lightweight Floor/Ceiling Structures

Cited by 18 publications

References 12 publications

Vibration Reduction in Lightweight Floor/Ceiling Systems with a Sand-Sawdust Damping Layer

Vibration Reduction in Lightweight Floor/Ceiling Systems with a Sand-Sawdust Damping Layer

Lightweight Floor/Ceiling Systems with Improved Impact Sound Insulation

The finite layer method for modelling the sound transmission through double walls

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